so did technology. recently, it's the digital footprint of dalliances that led to spectacular falls. remember congressman anthony weiner, who tweeted a photo of his privates. when the story broke, he denied it, claiming his twitter account had been hacked. eventually he confessed and resigned. >> i apologize first and foremost to my wife and to my family. >> reporter: there was client number nine, aka eliot spitzer, the governor of new york and former cnn anchor. when investigators followed his money, it revealed he spent thousands as a regular client of a call girl. he, too, stepped down. >> i have acted in a way that violates my obligations to my family and that violates my or any sense of right and wrong. >> reporter: and now comes general petraeus. done in by a simple click of the mouse. >> e-mail traffic, it's amazing that e-mail is still being used in such a careless and reckless fashion, because it's just evidence against you. >> reporter: modern science can also play a role. remember president c